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ESO: Hidden Secrets of Orion’s Clouds

Posted: Wed Jan 04, 2017 4:00 pm
by bystander
Hidden Secrets of Orion’s Clouds
ESO/VISTA Photo Release | 2017 Jan 04

VISTA survey gives most detailed view of Orion A molecular cloud in the near-infrared
[img3="Credit: ESO/VISTA/VISION survey"]https://cdn.eso.org/images/screen/eso1701a.jpg[/img3][hr][/hr]
This spectacular new image is one of the largest near-infrared high-resolution mosaics of the Orion A molecular cloud, the nearest known massive star factory, lying about 1350 light-years from Earth. It was taken using the VISTA infrared survey telescope at ESO’s Paranal Observatory in northern Chile and reveals many young stars and other objects normally buried deep inside the dusty clouds.

The new image from the VISION survey (VIenna Survey In Orion) is a montage of images taken in the near-infrared part of the spectrum [1] by the VISTA survey telescope at ESO’s Paranal Observatory in Chile. It covers the whole of the Orion A molecular cloud, one of the two giant molecular clouds in the Orion molecular cloud complex (OMC). Orion A extends for approximately eight degrees to the south of the familiar part of Orion known as the sword [2].

VISTA is the world’s largest dedicated survey telescope, and has a large field of view imaged with very sensitive infrared detectors, characteristics that made it ideal for obtaining the deep, high-quality infrared images required by this ambitious survey.

The VISION survey has resulted in a catalogue containing almost 800 000 individually identified stars, young stellar objects and distant galaxies, This represents better depth and coverage than any other survey of this region to date [3]. ...

VISION - Vienna survey in Orion I. VISTA Orion A Survey - Stefan Meingast et al
Click to play embedded YouTube video.

Re: ESO: Hidden Secrets of Orion’s Clouds

Posted: Thu Jan 05, 2017 5:45 am
by Ann
I found this frustrating! :evil:
http://www.eso.org/public/news/eso1701/ wrote:
This spectacular new image is one of the largest near-infrared high-resolution mosaics of the Orion A molecular cloud, the nearest known massive star factory, lying about 1350 light-years from Earth.
I take the "massive star factory" expression to mean that massive stars are forming here. The other interpretation, that this star factory is forming low-mass stars at a "massive" rate, seems less likely from a semantic point of view.

It should be pointed out that there are several nearby star factories that form low-mass stars at a fairly prodigious rate, such as the Rho Ophiuchi cloud and the NGC 2264 region of star formation. There is no terrible shortage of low-mass star formation. High-mass star formation is another matter entirely. If any massive stars are forming in or near the Orion Nbeula, I would very much appreciate if ESO pointed out which stellar embryos show signs of growing really big. But ESO have nothing to say about it, except this,
The new image represents a step towards a complete picture of the star formation processes in Orion A, for both low and high mass stars.
...which is completely unhelpful! :evil:

Ann

The nearest known massive star factory

Posted: Thu Jan 05, 2017 1:47 pm
by neufer
https://en.wikipedia.org/wiki/Liliom wrote:
Click to play embedded YouTube video.
<<Liliom is a 1909 play by the Hungarian playwright Ferenc Molnár. It was very famous in its own right during the early to mid-20th century, but is best known today as the basis for the Rodgers and Hammerstein musical Carousel. The play takes place partly in Budapest, Hungary, and partly in a waiting area just outside Heaven. The story concerns Liliom, a tough, cocky carousel barker who falls in love with Julie, a young woman who works as a maid. When both lose their jobs, Liliom begins mistreating Julie out of bitterness — even slapping her once — although he loves her. When she discovers she is pregnant, he is deliriously happy, but, unbeknownst to Julie, he agrees to participate with his friend Ficsur, a criminal, in a hold-up to obtain money to provide for the child. Liliom is unwilling to leave Julie and return to his jealous former employer, the carousel owner Mrs. Muskat, and feels that the robbery is his only way left to obtain financial security.

The hold-up is a disaster, but Ficsur escapes, and Liliom kills himself to avoid capture. He is sent to a fiery place, presumably Purgatory. Sixteen years later, he is allowed to return to Earth for one day to do a good deed for his now teenage daughter, Louise, whom he has never met. If he succeeds, he will be allowed to enter Heaven. He fails in the attempt, and is presumably sent to Hell. On his return to Earth, Liliom encounters his daughter, Louise, who like her mother is now a factory worker. Saying that he knew her father, he tries to give her a star he stole from the heavens.>>